<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>列表移动</title>
	<script src="/static/js3/jQuery-2.1.4/jquery-2.1.4.min.js"></script>
	<script>
		function echo(v) {
			$('#s1>option:eq(2)').prop('selected',true);
        }
	/*	function echo(i) {
			var index=i-1;
			var $option=$('option:eq('+index+')');
            $option.prop('selected',true);
        }*/

	</script>
</head>
<body>
	<select id="s1">
		<option value="1">选项1</option>
		<option value="2">选项2</option>
		<option value="3">选项3</option>
		<option value="4">选项4</option>
		<option value="5">选项5</option>
	</select>
	<br/>
	<input type="button" value="回显第3个选项" onclick="echo();"/><br/>
</body>
</html>